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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d28249ac3a3cab7e76019220ae590d9c1a76d581513b35c713f3d14cb83369' 
  AND token = 'werTRaYM01WGogYJsPPX8wusDjYfE7KfUJDtGdE6F/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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