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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42870b8c9c0af1209ca9e0c5c9e2ad7a6df13e5ef18196c62fe3ff4b7afc3523' 
  AND token = 'RtHbuLIyaWE6invhyLDvTDv/rFro8FfqfJ8qbO5NYAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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