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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6293c6073ca84bf25dea9b8e9e10dec28170b3a3ea8ceea6dcb260bb9352b7' 
  AND token = 'eYh1/oh8Ckw9ZConCwm3OPYgnp1dwYAMBOvdrsGxYr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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