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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e5931ed9b3974438c595ff26b8c30adf09c03d916da58a6c4dfaf4c2c4fa21' 
  AND token = 'aRE1UE/rPg6GIJDFKc0Kx1SsyrWZmcZXGJobvv08r7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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