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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fbf422b2eff66b235d12a639cf74d1c089aeffb9f95b268534672f89f762a91' 
  AND token = '0oZr1xLxQkXWnSGuTuFrC9Sw7Bhtj1WXVkyVSFEmnOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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