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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5e3fdfd0197fd5bc9f626d3897765584d44d2573d801c23fd6b912028cc037' 
  AND token = 'DWdVpT9+5EvnryndSWrC2zg1IuCevLI5LnE/JKPpl3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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