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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69388ef32fb4dabf413bff0b2b4c695c653ef146051d545a971ed406c5f94b2' 
  AND token = 'hbBG1WPJaJKc2PPKgmwDsbC4AylxCvspt61Qpli7AVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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