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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ecfa011f9887c71e42b22251b34b8a51370b59370814232b303d80249a6e6d' 
  AND token = 'yZS26wO6dTF05jXRJVH5pFSWXPG8IU2W4Ali9xNN+54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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