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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0087603f45413fa4d7a97815ef457ee928cac69b9b488bca053235301e42981' 
  AND token = 'Xw8i4YA5/cxr/Z6p83il39IP8dyu1tWveE1opPGyU3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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