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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7b71ad706664e17f7cc6f451b643300db330e93c3dcb308e2fd02b93e83c54' 
  AND token = 'c3/hwJZUZLS8tFJuuN+1S1d6811e+OA9rMbUAwLZNxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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