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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3040d193bf242ba8449b403a2dc301e7687ce1539c0494ba2e6d9b14ecdfbd6a' 
  AND token = '2uRThjRahZkfQNTWZiusmU3vBoe5cl9pcYV2CoCXbok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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