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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4dc4c6539857ac858adb136247e6609b6e77192cd5640c9ad44214dc6ad734' 
  AND token = 'mn1NBFW9sTDCDn7jF9sdHdv90P2rBLzoNjhD67q30b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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