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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc91b2e2f12e5d237fffeb19c0308686cc3b48196609a8ef9d2188ebaa4f87c0' 
  AND token = 'hWHtr2zx87k+zIlfSiIrQ8XUjruKT0xhVA1LpSEj/4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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