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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da00f5bca6a1ddbada0b1052db0406b0a086a9c2a17304a324c4f213810b349' 
  AND token = 'k99TAfu1upVT2XDVqO1yg4T8J+5Hl3TooJaaZaqowC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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