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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '916931ddf5d5e5ff2d8b1214f7e032c1d484d2b69ea4fc1541120295f6caa61a' 
  AND token = '1K68gzQ1mroHdNljByekfbXe6UvouvUnLr4TjrrDCN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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