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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76320cedc426104f183489c7e44f7deb91c20a527d29ac2bec9d4a54382e572d' 
  AND token = 'QVwI9DJfal39+i27l7MGPjlDqfoTm2LK+nKb3Pn43RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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