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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d58524d54b79de5b8c10e35c9e8ba02c3729827c7df0c482376bb6332b19f3' 
  AND token = 'soXPKcnkhmHTlr4tiBWBapFd0JmKB2d2Im/LkZogmHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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