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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d12c54bbfad5779053e15b24f042245745ae513170df442dd3339d4baa553e' 
  AND token = 'cJRLaIbKWKvUzW8iQlKxjpGdKBIyXNT9IjiWLj2EbPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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