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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409a90b76d2437fad15fc3038d50becd743a12564c79815277ab1e96d3f0b7d8' 
  AND token = 'btkkXRANxiPM2b/SaUKiVf3pleFwmbBeek3Vf1jg7WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}