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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3376ef9f93fd4ce3a19638add03d07bc3fbb4963c8882ca4a1cd6c3d968880' 
  AND token = '9Q63B1LIDeKhQRmyZLZ1827XRPHSIiN8KuB9CjGVCTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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