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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b9ed617660e3495b0d82a93802f5ec8f29a593db8f1f49cc25ad5316f522235' 
  AND token = '1zmK8vNQOmHuzfG2aXkApAfMwZExV7roWYyyIjkyZ1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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