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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c338c74b81b4757bbe78293829bccca025c634ffabeee3f49868f5292efec26e' 
  AND token = 'r+T3K6WbqACiLsPZtXxbulw36ljZ8F72qDZiT8MRX/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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