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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c93e6ea69ac1fc1075d01ffc88ea9b28aafbf673b9975f5d18cd675cdf7fb5' 
  AND token = 'jAdFW4OzaIJvGOn+x45cnrEV1p21ul7h584slR/iMOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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