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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7211906cde39d1c7d546eabecc3c0258c61683fa1a1185fa7c5b944a8f8ea9fc' 
  AND token = 'WokLFFcMO+ML92YrPHJAJhVHNkRcdgPGB3Hg90g5fUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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