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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64204d2ec40a076b76e340f4f73f4aaea680dd72e047a0414ae2c53fe5cbfbdd' 
  AND token = 'bnJwnJz3Ge/2j12C/UDUfc6uqsuY7S9QGYvmI4gTZbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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