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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e27ec03886d5e9c36d6a51d39775837eed965ff993b2ae3996d6f76252b6158' 
  AND token = 'Q2yo3PM8OqywIDOE4aw+27pukfiQUNFGnxl5+NqHzTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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