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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64edeb21b35f7c0d6b36d79b73adb763e05e1d3ad104edfce861959d414a60b9' 
  AND token = 'k5gm0vA37bIDiMYVIinOLJgRIxKjhWFzKmA85enrXHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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