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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c44f8cc549c732d5df0d10da2540821073ca630fa3dfed017f44a9c4d9280d' 
  AND token = 'Yp2i8S1h8a2QHhQeOzgzTmBHUjPj5gf1X09LrQ5lfN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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