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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c69861faa9bab27b44983cddd8fd0e5deeb896cb4351aee8b62fec9ac7f7cc' 
  AND token = 'fTmrySBujo6e5dEGzcKCpnHx6EpokH5a6bbGcd9qJQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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