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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383971d2c78a2a6bfa62cb4022c99331ba7982fa56191e5802c179a6e0b7e208' 
  AND token = '9lNpv2tXQNP0oETArVS0WDG6M17S1FUcQusEpdt/QFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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