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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd098a90494054e4adbae1acc67d80ca8135f262deda88086fe45c225dc7e3a79' 
  AND token = 'YoMgtI5UZlhxkuU+hoji/Mzc6z7yvrm5IiLWalXvhDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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