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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7caca1a027c42f784ca8b6152db0aec6ea422e0b74f7304b0112b7526f5c2029' 
  AND token = 'IXznUfCTdq9LRSwXgN1qITIJwJYbj//YZTLU3zLGauQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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