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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ef987eba94909bc3f183f7dfe3bb054a8f66a680f2f45aa59936ce0403d89f' 
  AND token = 'onDFxvkmLTquV8DK0PiyCMt+t+V8vwetuPVkgz3EDJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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