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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75e5863ebfe94df3e4ae0fecc52634e64bd545925c3fcf984d8152106a1ce53' 
  AND token = 'WO6LB9zEV7obDx6B1q0kOsQ/WEY3Q1SO2x7Wod/KTNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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