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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bbdbd9a8ad1bd42b537b30d5ab6d03e93a0c42804a53fdf482c13c010e5d27b' 
  AND token = 'i0txvLjRSWzv0dYuE9JtpoeXwUAGaCkhU5TbjyG+g6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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