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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7d2e41a41003d0b47f0ade0d63eee950d7150ad6c5b589b9fff46356028e30' 
  AND token = '3kZJyeMHrukCYJIaoUbvoCrdLiqTyyUYjCgF0lc7Mgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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