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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b535ad8eb854471d1ed3c7096bd7328acc9112d6035747a5c3f30a09f9f823' 
  AND token = 'tILb6RkAnb1o+eu/QAi9mrDqvPhRfqfqKcy0yztNcIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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