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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a100b279f73592884aa7c4468e38e3ef1cfe70d036968f96adc8b021432ce65' 
  AND token = 'XzL9QaJU4L3T3Qo14INDv5tlKZHEYXaEq4vd8oXary8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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