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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a72a1e2045cbe5252693c3b4c6c2589394b85d9d7766daf2bdd760808ac4dac' 
  AND token = '1YXZ4a+gI+QugdQDAjgYwcD5kRY0AEIaVf/Q8qVvAZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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