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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6056ef36925a02b94cdda39ffed284fefa0e179a2a309fdfe9dcd133d21c0da6' 
  AND token = 'G34CuPtSQ+yt88xw37M5a/D9YGPG/5SeTX5sODJhzS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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