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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11fca039b93a974c9938b23c0607a608f8949da28149327e4362cb0f07baba8d' 
  AND token = 'dyn6NyzLcUjT3agVCPSYWF8QHBT9vGfT0xhDx28ofjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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