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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f6d14a6eeeea4b0339678fdbd1dfad5b7e472ab5274c66d1d98a49c45ae031' 
  AND token = 'nnoaSF8vDnQJjqGIQ4b0Ycp4Tv63G6j0WC24hW0oME0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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