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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e402c38a7142ee2022bef1de65a9096a3e5e22d1a568f5876848069652bd7db0' 
  AND token = 'pm64IG/4JPX4wqdbQ2TYHY6QuwOn6gQB2myvUpMm3g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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