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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db330f590898739dbd4ecb067f49c7ccc92330c68df83107e23076f8b7d20c91' 
  AND token = 'R4Pc6Tpw0PQugI9XjIgnzA4rCmqRTwOVW1dBIs8KA54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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