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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1c68a89b053c4e79961f326313991e9db40871ec7c27769c359bae98198432' 
  AND token = '42j64t80o0nD00c6eBAIEdiqA5Lhn2GqNX9h9dh84y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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