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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0add40a42b88c5d2efbb12b1dee387e7c8c9cbb5ecf81067d852d13e36019d3d' 
  AND token = 'FyfOcii1qzt+Sdszw59lkneZns8rJ6BL8dvR49gss28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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