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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e430fb4d8292de1297d7b3188a8eb059483e0d39897bc39186c94327645691' 
  AND token = 'nbYe2F6JkzoVFmI5ksznlhNd8F1jZFYQbEB3j9+oXyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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