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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd73ebd09c450bc0f4e06674561cc9e624dc804fab9987e22fa6c374c105163e' 
  AND token = '7sTc5kO1WRIEhRnlIVF+Qpb/80acdlLDBwOxfRfQhtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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