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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3835a39d62a6eab230364c9004b03049dd7120c50e5850753e5ed3e0b5923ba' 
  AND token = 'SUKiNpRavdACBVxKCUPK0sApSV0XBxOSSoQ/nY4aP0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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