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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '258876638cc2ac3bc2d54ff685b02e9d122eb9713bf64903fa2a0591f04a7448' 
  AND token = 'oOyNnLnVztODab3Tq8vSVcZxz1C7MVH6O9dkyJByO2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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