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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9152056c64ec6c0b5e89a74638a06c2c109911758dd395cb7f5d52e9bc4d518' 
  AND token = 'ExR1FKhsKjm9+xIwuStJZWK6zs7uaQ/RnG2KckQyhlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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